Missing bushing/clamps

[mkrueger (Mike G. Krueger, 2344)]

I always call out any wire entering a panel/knockout without a bushing/clamp. I was just watching http://www.nachi.org/inspection-video-electrical-joe-tedesco-2.htm and they stated this is needed only if the wire is 4 awg or larger???

If this is correct why only 4awg or larger???

Thank you

[rcooke (Roy D. Cooke, Sr)]

all wires need to be protected against sharp edges .

[rmeier2 (Robert Meier)]

@mkrueger

I always call out any wire entering a panel/knockout without a bushing/clamp. I was just watching Electrical Inspection Training Videos with Joe Tedesco Part 2 - InterNACHI® and they stated this is needed only if the wire is 4 awg or larger???

If this is correct why only 4awg or larger???

Thank you

Not sure what you mean by clamp but any raceway with conductors #4 or larger require an insulating bushing. A cable connector such as for SE cable does not require a bushing even for #4 or larger conductors.

300.4(G) Insulated Fittings. Where raceways contain 4 AWG
or larger insulated circuit conductors, and these conductors
enter a cabinet, a box, an enclosure, or a raceway, the con-
ductors shall be protected by an identified fitting providing
a smoothly rounded insulating surface, unless the conduc-
tors are separated from the fitting or raceway by identified
insulating material that is securely fastened in place.
Exception: Where threaded hubs or bosses that are an
integral part of a cabinet, box, enclosure, or raceway pro-
vide a smoothly rounded or flared entry for conductors.
Conduit bushings constructed wholly of insulating ma-
terial shall not be used to secure a fitting or raceway. The
insulating fitting or insulating material shall have a tem-
perature rating not less than the insulation temperature rat-
ing of the installed conductors.

[Jim_Port]

Clamps or connectors attach a cable to the enclosure. Bushing are installed over the end of a fitting to provide a smooth surface. They have no means to attach anything to the enclosure. Two items with different functions. Robert provided one code cite. The other is in Article 314.

[mkrueger (Mike G. Krueger, 2344)]

Thank you all - I found some of the code ref. on this:
**
NEC 314.17(B)&© **[FONT=Arial,Arial][size=2]The outer jacket of type NM cable shall be secured to the box and extend into the box at least ¼ inch.
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file:///C:/Users/Admin/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif

[size=3]314.17 Conductors Entering Boxes, Conduit Bodies, or Fittings.
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file:///C:/Users/Admin/AppData/Local/Temp/msohtmlclip1/01/clip_image004.gif

  [/FONT]Conductors entering boxes, conduit bodies, or fittings shall be protected from abrasion and shall comply with 314.17(A) through (D). 

I couldn’t find all of the code A - D.
I see circuit branch wires entering metal junction boxes, switches, receptacles and panels without connectors often.
Have a blessed day!

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